Резюме
Иссле¶rt;овaлось рaсnре¶rt;еленuе рa¶rt;uоaкmuвных(Th, U, K) u uзбрaнных ре¶rt;кuх(Rb, Sr, Ba, Y, Zr, V, Cr, Ni) элеменmов в
рaнулumовых nо¶rt;орaх Сaксонско
о
рaнулumово
о комnлексa. Было nокaзaно, чmо uссле¶rt;уемые
рaнулumы nо хuмuческому хaрaкmеру очень nохоже нa
рaнулumы uз ¶rt;ру
uх облaсmеŭ Чешско
о мaссuвa, uменно uз южноŭ Чехuu. Грaнулumы можно nо uх хuмuческому сосmaву рaз¶rt;елumь ¶rt;о ¶rt;вух
руnn; в
руnnуA nрuнa¶rt;лежam
лaвным обрaзом aцu¶rt;ные u субaцu¶rt;ные
рaнулumы (K 2O>2,5%, Si O2>68%), в
руnnуB сре¶rt;нuе u основные
рaнулumы (K 2O<2,5%, SiO2<68%). Меж¶rt;у эmuмu
руnnaмu сущесmвуюm сmamuсmuческu сущесmвенные рaзнuцы ¶rt;ля всех
лaвных окuсов u ¶rt;ля некоmорых ре¶rt;кuх элеменmов(Rb, V, Cr, Ni). Сaксонскuе
рaнулumы nо¶rt;хо¶rt;яm в uсзвесmкобо-щелочноŭ mрен¶rt; кaк u южно-чешскuе
рaнулumы;
рaнулumыA нaхо¶rt;яmся
лaвным обрaзом в рuолumовом nоле, u
рaнулumыB
лaвньм обрaзом в ¶rt;aцumобом, aн¶rt;есumовом u бaзaльmовом nоле эmо
о mрен¶rt;a. Иссле¶rt;уемые
рaнулumы — uменно uз
руnnыA — хaрaкmерuзуmся нuзкuм со¶rt;ержaнuем da¶rt;uоaкmuвных элеменmовTh uU.
Summary
The distribution of radioactive(Th, U, K), major and selected trace(Rb, Sr, Ba, Y, Zr, V, Cr, Ni) elements of granulites from the Saxonian Granulite Complex was studied. Similarly to the South Bohemian granulites, the Saxonian granulites can be divided according to the contents of their major and trace elements into two main groups, groupA containing mostly acid and subacid granulites (K2O>2.5%, SiO2>68%), and groupB containing mostly intermediate and basic granulites (K2O<2.5%, SiO2<68%). Statistically significant differences between groupsA andB were found for all major oxides and several trace elements(Rb, V, Cr, Ni). The Saxonian granulites follow the same calc-alkaline trend as the South Bohemian, granulitesA being placed mostly in the rhyolite field and granulitesB mostly in the dacite, andesite and basalt fields of this trend. The investigated granulites are characterized by a considerable scatter ofTh andU contents accompanied by very variableTh/U ratios; theTh andU concentrations of granulitesA are substantially lower than is usual for rocks of corresponding acidity.
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References
J. Fiala, V. Vaňková: Chemistry of Moldanubian Granulites. In: V. Zoubek (Ed.): Precambrian of Younger Belts. J. Wiley & Sons, London (in print).
J. Fiala, J. Hally, Z. Houdková, V. Vaňková, M. Krešl: Chemismus a radioaktivita jihočeských granulitů. In: Z. Pouba (Ed.): Korelace proterozoických a paleozoických stratiformních ložisek VII. ÚÚG, Př. F. U. K., Praha 1984, 171.
O. Matějovská, V. Vaňková: The Concentrations of Radioactive and Trace Elements in the Granulites From the Southeast Margin of the Bohemian Massif (Czechoslovakia). Studia geoph. et geod., 24 (1980), 285.
B. L. Weaver, J. Tarney, B. F. Windley, E. B. Sugavanam, V. Rao Venkata: Madras Granulites: Geochemistry and P-T conditions of Crystallization. In: B. F. Windley, S. M. Naqui (Eds.): Archean Geochemistry. Elsevier, Amsterdam 1978, 177.
G. P. Sighinolfi: Investigations into Deep Crustal Levels: Fractionating effects and Geochemical Trends Related to High-grade Metamorphism. Geochim. et Cosmochim. Acta, 35 (1971), 1005.
G. P. Sighinolfi, T. Sakai: U and Th in Archean Granulite Facies Terrains of Bahia. Geochem. Journ., 11 (1977), 33.
H. Rosenbusch: Elemente der Gesteinslehre. E. Schweizerbart'sche Vlg, Stuttgart 1898.
P. Escola: The Mineralfacies of Rocks. Norsk. geol., 6 (1921), 143.
C. D. Werner: Saxonian Granulite Massif. In: Ophiolites and Initialites of Northern Border of the Bohemian Massif. Guide Book of Excursions in GDR and PPR, Berg-Akad. Freiberg-Potsdam 1981.
M. Krešl, V. Vaňková: Radioactivity and Heat Production Data from Several Boreholes in the Bohemian Massif. Studia geoph. et geod., 22 (1978), 165.
M. Krešl, V. Vaňková: A Method of Reducing the Disturbing Effects in Gamma-spectrometric Measurements of Rock Radioactivity. Studia geoph. et geod., 26 (1982), 66.
J. Bartošek: Výzkum přirozené radioaktivity slabě aktivních hornin. Kand. disert., Archiv Geofyzika n. p., Brno 1972 (not published).
L. S. Jensen: A New Cation Plot for Classifying Subalkalic Volcanic Rocks. Ontario Div. Mines, MP 66, Toronto 1976.
A. Peccerillo, S. R. Taylor: Geochemistry of Eocene Calc-alkaline Volcanic Rocks from Kastamonu Area, Northern Turkey. Contrib. Miner. Petrol., 68 (1976), 63.
H. G. Scharbert, J. Korkisch, I. Stefan: Uranium, Thorium and Potassium in Granulite Facies Rocks, Bohemian Massif, Lower Austria, Austria. Tschermaks Min. Petr. Mitt., 23 (1976), 223.
H. J. Behr: Subfluenz-Prozesse in Grundgebirge-Stockwerk Mitteleuropas. Zschr. Dtsch. Geol. Gess., 129 (1978), 263.
S. Vrána, P. Jakeš: Orthopyroxene and Two-pyroxene Granulites from a Segment of Charnockitic Crust in Southern Bohemia. Věst. ÚÚG, 57 (1982), 129.
H. J. Behr: Beiträge zur petrographischen und tektonischen Analyse des sächsischen Granulitgebirges. Freiberg. Forschhft., C 119 (1961), S 5, Akad. Vlg., Berlin.
W. Neumann: Über fossile und metamorphe Verwitterungsbildungen auf dem sächsischen Granulitmassiv und an seinem Rande. Z. Geol. Wiss., 2 (1974), 705.
W. Neumann: Präkambrium der Saxothuringisch-Lugischen Zone der Mitteleuropäischen Varisciden. Exk. Führer Feldarbeiten der PK IX, UK 1 (1980). Zentralinst. Physik d. Erde, Berlin.
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Fiala, J., Vaňková, V. Radioactivity and geochemistry of granulites and some related rocks from the saxonian granulite complex. Stud Geophys Geod 29, 374–394 (1985). https://doi.org/10.1007/BF01641627
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DOI: https://doi.org/10.1007/BF01641627